1. June, 2016 1 GSICS USER GUIDE Using GSICS Products and Services Manik Bali, Tim Hewison, Larry Flynn and Jerome Lafeuille 2016 GSICS Executive Panel Meeting Biot, France 3 June 2016

2. June, 2016 2 Outline Introduction Target audience of the document Proposed Contents Life cycle and Maturity of the GUG Conclusion

3. June, 2016 3 Introduction Guidance from EP-16 GSICS User Guide (or Guide to GSICS Products and Services) should provide the users with a general overview of the range of GSICS products and other available deliverables, and how they can be used. Further guidance from WMO Be informative enough to guide "new users" (actual or potential), unfamiliar with GSICS. Should focus on information which is not product-specific, but relevant to whole categories of products, models, tools, or other resources. Should guide the users to where they can find the more detailed info

4. June, 2016 4 GSICS User Guide4 GSICS User Guide4 1.Purpose of the document4 1.Purpose of the document4 2.Scope of GSICS4 2.Scope of GSICS4 3.Challenges of space-based instrument calibration4 3.Challenges of space-based instrument calibration4 – 4.GSICS users6 4.GSICS users6 – 4.1.The satellite data user community6 4.1.The satellite data user community6 – 4.2.The GSICS Member agencies6 4.2.The GSICS Member agencies6 5.GSICS deliverables6 5.GSICS deliverables6 6.Calibration references7 6.Calibration references7 7.GSICS intercalibration methodology8 7.GSICS intercalibration methodology8 – 7.1.Principles8 7.1.Principles8 – 7.2.Product acceptance8 7.2.Product acceptance8 – 7.3.Intercalibration by Simultaneous Nadir Observation8 7.3.Intercalibration by Simultaneous Nadir Observation8 – 7.4.Specific considerations applicable to Solar channel calibration (if any)12 7.4.Specific considerations applicable to Solar channel calibration (if any)12 – 7.5.Specific considerations for Microwave channel calibration (if relevant)12 7.5.Specific considerations for Microwave channel calibration (if relevant)12 – 7.6.Anything about double-differences with GEO or with NWP (if relevant?)12 7.6.Anything about double-differences with GEO or with NWP (if relevant?)12 – 7.7.Anything about bias removal by matching overlapping series (?)12 7.7.Anything about bias removal by matching overlapping series (?)12 8.GSICS product overview13 8.GSICS product overview13 – 8.1.Product categories13 8.1.Product categories13 – 8.2.Difference between Near Real-Time and retrospective products13 8.2.Difference between Near Real-Time and retrospective products13 – 8.3.Algorithms for archive recalibration14 8.3.Algorithms for archive recalibration14 – 8.4.Summary characteristics of GSICS products15 8.4.Summary characteristics of GSICS products15 9.GSICS Services and Tools16 9.GSICS Services and Tools16 – 9.1.Access to GSICS products16 9.1.Access to GSICS products16 – 9.2.Data access and utilization tools16 9.2.Data access and utilization tools16 – 9.3.Examples of utilization16 9.3.Examples of utilization16 – 9.4.User information tools16 9.4.User information tools16 ANNEXES17 ANNEXES17 Annex 1: GSICS structure17 Annex 1: GSICS structure17 Annex 2: Contacts18 Annex 2: Contacts18 Annex 3: Glossary18 Annex 3: Glossary18 Proposed Table of Contents How to access and use GSICS resources and Data

5. June, 2016 5 Target audience of the document Satellite operators – e.g. new staff Satellite data users – New or potential GUMS subscribers – New GSICS Quarterly readers – Participants in GSICS Users Workshop Partner organizations – To understand the scope of GSICS and identify areas of cooperation/complementarity

6. June, 2016 6 GSICS Data files are inter-calibration of Monitored and Reference Instrument ( i.e Monitored Inst Radiance- Ref Instrument Radiance ) Data sets shipped in netcdf-4 format on a daily basis. For instrument monitoring purpose one can directly use an idl MATLAB routine to read and plot and get an answer about instrument measurement anomalies over time. Use of GSICS Data for Monitoring Application of Monitoring of FY-3E Monitoring

7. June, 2016 7 It is a constant endeavour to use GSICS data for climate monitoring. Complete steps are stated in any FCDR ATBD ( for eg FIDUCEO or MSU/AMSU ) however GSICS baseline SNO algorithms ( beta tested) are a basis for gathering collocations that eventually resolve/quantify the monitored instrument bias in multi- dimensions (Scan angle, trends, diurnal etc..). Once quantified these are corrected to produce a time series that can be used for climate monitoring ( see details FIDUCEO document) and routinely validated using independent validation techniques. Use of GSICS data for Climate Monitoring

8. June, 2016 8 GSICS Algorithms play a central role in re-calibration of legacy instruments such as the AVHRR. Due to its length ( 30 yrs +), Once AVHRR are re-calibrated they can provide close to climate scale accuracy and become a vital time series useful for extracting climate signals from space. Use of GSICS Data/Algorithms for Re-calibration of legacy instruments

9. June, 2016 9 Stable and accurate in-orbit instruments are vital for effectively monitoring GEO and LEO instruments. Cascade of reference instruments are critically needed to re- calibrate existing and past instruments. CLARREO is a mission planned to provide SI traceable radiances that can be used as an absolute in-orbit reference. Prior to CLARREO we need a procedure to assign a reference instrument status to in-orbit instrument. GSICS is currently finalizing a procedure and process to Use of GSICS Process to identify In-orbit Reference instruments

10. June, 2016 10 Product version Control Data released with disclaimer C Operations and distribution plan Data user’s guide T=180 days Founding concepts Supporting models Data Archived and Free Access ATBD Peer-Publications Product quality indicator description Traceability document T=365 days Preoperational Phase Demonstration Phase Fill out GSICS Product Acceptance Form ( GPAF )GPAF Submission Phase Product is fully accepted by GSICS Executive Panel (EP) and maintained within GSICS and distributed to the public. Product Logs, Data Usage Operational Phase The GSICS Procedure for Product acceptance has been inherited from QA4EO ( a CEOS entity ) The GPPA is the GSICS: –Product developers pathway to obtain a “Stamp of Approval” for a potential product –Data users window to GSICS product quality and “fitness for purpose” –Governing body reference for judging GSICS product fitness Use of GSICS Procedure for product acceptance to assign maturity GSICS products

11. June, 2016 11 Way forward ? Confirm the target audience – New and potential GSICS users – Interested in, but unfamiliar with GSICS Scope of document ? – High-level overview which should help the user to find his way to the detailed technical information (product specific, standards, tools) on WIKI or elsewhere – Provide examples of practical use of the various types of deliverables – Also guidance for contributing products through the GPPA ? – Include information on resources such as plotting tool What are the needs of the users ? – Consult Users Workshop … fine tune the doc based on their use of GSICS entities.